Route restriction

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Hi,

I believe that Linux imposes the following restriction while
installing a route.

"A gw addr must belong to the same network as the interface on which
the route is being set up". Why do we have this restriction? I have
seen diagrams (i mean router topologies) showing ASes which are
labeled "5.0.0.0/8" and "6.0.0.0/8". The diagram shows that BGP is
running on the edge routers. How do these edge routers have routes to
each other even though they belong to two different networks (namely
5.0.0.08 and 6.0.0.0/8)? Does the restriction exist in this situation
as well? Why or why not?

Thanks in advance,
Amit Khanna
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